Disc type ionic conductivity detection instrument

Abstract

The utility model discloses a disc type ionic conductivity detection instrument, which realizes automatic and multi-station ionic conductivity detection, greatly improves the experimental test efficiency and accuracy, and comprises a sealing box, a main body frame arranged in the sealing box, and a pressure applying assembly, a bearing assembly and a liquid injection assembly which are arranged on the main body frame, the sealing box is provided with a sealing door which is movably opened and closed, an air inlet and an air outlet; the pressure applying assembly comprises a pressure plate which performs lifting motion relative to the bearing assembly; a plurality of mounting holes are formed in the pressure plate at equal angle intervals, and pistons are mounted in the mounting holes; a spring is arranged between the piston and the inner wall of the mounting hole; pressing rods are mounted on the lower end surfaces of the pistons; the bearing assembly comprises a bearing disc rotationally matched with the main body frame, and a plurality of electrolyte grooves are formed in the bearing disc; the electrolyte injection assembly is arranged on the side edge of the bearing disc and used for automatically injecting electrolyte into all the electrolyte tanks.

Description

Technical Field

[0001] This utility model belongs to the field of battery testing technology, and specifically refers to a disc-type ionic conductivity testing instrument. Background Technology

[0002] Electrode ion resistance / separator ion conductivity are parameters that describe the complexity of lithium ion transport paths in electrode pores or separator pores when a sample is immersed in electrolyte. They directly affect the ion transport efficiency of the battery, and thus affect the battery's rate capability and cycle performance. They are one of the key electrode indicators that experimental R&D personnel pay close attention to.

[0003] Currently, the commonly used methods for detecting ionic conductivity require manual assembly and electrolyte injection in a glove box, followed by testing via an electrochemical workstation. This process is cumbersome and has low overall testing efficiency. Utility Model Content

[0004] The main purpose of this invention is to provide a disc-type ionic conductivity detector, which solves the problems existing in the prior art, realizes automated, multi-station ionic conductivity detection, and greatly improves experimental testing efficiency and accuracy.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A disc-type ionic conductivity detector includes a sealed box, a main frame installed inside the sealed box, and a pressure-applying component, a support component, and a liquid injection component installed on the main frame. The sealed box is provided with a movably opening and closing sealing door, an air inlet, and an air outlet. The pressure-applying component includes a pressure plate that moves up and down relative to the support component. The pressure plate has a plurality of mounting holes spaced at equal angles, and a piston is installed in each mounting hole. A spring is provided between the piston and the inner wall of the mounting hole. A pressure rod is installed on the lower end face of the piston. The support component includes a support tray that rotates with the main frame, and a plurality of electrolyte tanks are provided on the support tray. The liquid injection component is located on the side of the support tray and is used to automatically inject electrolyte into each electrolyte tank.

[0007] The main frame includes a top plate, a bottom plate, and several pillars; the top plate is parallel to the bottom plate, and the pillars are supported between the top plate and the bottom plate; the pressure-applying component is installed below the top plate, and the support component is installed above the bottom plate.

[0008] The disc-type ionic conductivity detector also includes a dew point sensor and a pressure sensor installed inside the sealed box, which are used to detect the humidity and pressure inside the sealed box, respectively.

[0009] The disc-type ionic conductivity detector further includes a driving assembly for driving the pressure application component; the driving assembly includes a fixed bracket, a first motor, a guide rod, a lifting plate, a connecting rod, a trapezoidal nut, and a trapezoidal screw; the fixed bracket and the first motor are both mounted on the upper surface of the main frame; a guide rod connects the fixed bracket and the main frame; the lifting plate is slidably fitted on the guide rod; the connecting rod passes through the main frame, and its upper and lower ends are respectively connected to the lifting plate and the pressure plate; a trapezoidal nut is mounted on the lifting plate, and the trapezoidal screw is threadedly connected to the trapezoidal nut, with its two ends respectively rotatably fitted to the fixed bracket and the main frame; the first motor is drively connected to the trapezoidal screw.

[0010] Preferably, the output end of the first motor is connected to a drive wheel, and the circumference of the trapezoidal screw is fixedly connected to a driven wheel. A first synchronous belt is tensioned and wound between the drive wheel and the driven wheel. The main frame and the fixed bracket are both provided with bearings for the trapezoidal screw to rotate and engage.

[0011] Preferably, the main frame is provided with a guide sleeve for the connecting rod to pass through; at least two pairs of connecting rods and guide sleeves are provided, and are arranged at equal angular intervals around the trapezoidal screw.

[0012] The piston has a mounting groove on its lower end face, and the upper end of the pressure rod is sealed and embedded in the mounting groove to achieve a detachable connection; at least one sealing ring is provided between the circumferential surface of the pressure rod and the inner wall of the piston.

[0013] The piston has a screw section on its upper end face and a limit ring on its lower circumferential surface; the screw section extends upward through the mounting hole and is threadedly connected to a fixing nut; the spring is sleeved on the circumferential surface of the piston, and its two ends abut against the end wall of the mounting hole and the limit ring, respectively.

[0014] The support assembly further includes a second motor, a synchronous pulley, a coupling, and a second synchronous belt; the second motor is mounted on the main frame, the synchronous pulley is coaxially connected to the support tray through the coupling, and the second motor and the synchronous pulley are connected by a second synchronous belt.

[0015] The liquid injection assembly includes an injection head and an electrolyte bottle disposed on the side of the support tray, and a plunger pump connecting the injection head and the electrolyte bottle.

[0016] After adopting the above technical solution, the present invention has the following technical effects:

[0017] This invention requires only manual opening and closing of the sealing door to check the instrument's condition and set its parameters; all other testing operations are performed automatically. Specifically, the sample to be tested is placed in the electrolyte tank, and the electrolyte is injected into each tank one by one by the injection component. Then, the pressure plate presses down to apply pressure to the sample in the corresponding electrolyte tank, making them fit tightly together. The pressure rod 34 and the electrolyte tank 42 are connected to the positive and negative terminals of the instrument's EIS module, respectively. Thus, the ionic conductivity of the electrolyte can be detected by the instrument. At the same time, this invention can perform ionic conductivity tests on multiple electrolyte tanks simultaneously, which greatly simplifies manual operation and improves experimental testing efficiency and accuracy. The disc-shaped pressure and support components are more compact and occupy less space. Attached Figure Description

[0018] Figure 1 This is a perspective view of a specific embodiment of the present utility model.

[0019] Figure 2 This is a partial three-dimensional structure of a specific embodiment of the present utility model. Figure 1 .

[0020] Figure 3 This is a partial three-dimensional structure of a specific embodiment of the present utility model. Figure 2 .

[0021] Figure 4 This is a partial structural front view of a specific embodiment of the present utility model.

[0022] Figure 5 This is an exploded view of the pressure application component in a specific embodiment of the present invention.

[0023] Explanation of icon numbers:

[0024] 1-Sealed box; 11-Sealed door;

[0025] 2-Main frame; 21-Top slab; 22-Bottom slab; 23-Column; 24-Guide sleeve;

[0026] 3-Pressure application assembly; 31-Pressure plate; 311-Mounting hole; 32-Piston; 321-Screw section; 322-Limit ring; 33-Spring; 34-Pressure rod; 35-Sealing ring; 36-Fixing nut;

[0027] 4-Support assembly; 41-Support tray; 42-Electrolyte tank; 43-Second motor; 44-Synchronous pulley; 45-Coupling; 46-Second synchronous belt;

[0028] 5-Injection assembly; 51-Injection head; 52-Electrolyte bottle; 53-Plunger pump; 54-Two-way threaded valve;

[0029] 6-Drive assembly; 61-Fixed bracket; 62-First motor; 63-Guide rod; 64-Lifting plate; 65-Connecting rod; 66-Trapezoidal nut; 67-Trapezoidal screw; 68-Driven wheel; 69-First synchronous belt; 610-Bearing. Detailed Implementation

[0030] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0031] refer to Figure 1-5 As shown, this utility model discloses a disc-type ionic conductivity detector, including a sealed box 1, a main frame 2 installed inside the sealed box 1, and a pressure application component 3, a support component 4, and a liquid injection component 5 installed on the main frame 2.

[0032] The sealed box 1 is equipped with a movable sealing door 11, as well as an air inlet and an air outlet. Figure 1 (Not shown in the image); the air inlet is used to connect to the inert gas tank, and the air outlet is used to connect to the vacuum pump.

[0033] The pressure application component 3 includes a pressure plate 31 that moves up and down relative to the support component 4; the pressure plate 31 is provided with a plurality of mounting holes 311 at equal angular intervals, and a piston 32 is installed in the mounting holes 311; a spring 33 is provided between the piston 32 and the inner wall of the mounting hole 311 so that the piston 32 has a downward tendency to move, thereby providing a clamping force; a pressure rod 34 is installed on the lower end face of the piston 32; during testing, a spring 33 with a corresponding elastic coefficient can be selected according to different testing requirements;

[0034] The support component 4 includes a support tray 41 that rotates with the main frame 2, and a plurality of electrolyte tanks 42 are provided on the support tray 41;

[0035] The electrolyte injection assembly 5 is located on the side of the support tray 41 and is used to automatically inject electrolyte into each electrolyte tank 42.

[0036] With the above solution, this invention only requires manual opening and closing of the sealing door 11 to check the instrument status and set the instrument parameters. All other testing operations are automatically performed mechanically. Specifically, the sample to be tested is placed in the electrolyte tank 42, and the electrolyte is injected into each electrolyte tank 42 one by one by the liquid injection component 5. Then, the pressure plate 31 presses down so that the pressure rod 34 applies pressure to the sample to be tested in the corresponding electrolyte tank 42 to make them fit tightly. The pressure rod 34 and the electrolyte tank 42 are respectively connected to the positive and negative electrodes of the instrument's EIS module (Electrochemical Impedance Spectroscopy Module). Thus, the ionic conductivity of the electrolyte can be detected by the instrument. At the same time, this invention can simultaneously test the ionic conductivity of multiple electrolyte tanks 42, which greatly simplifies manual operation and improves experimental testing efficiency and accuracy. The disc-shaped pressure component 3 and support component 4 are more compact and occupy less space.

[0037] The following are specific embodiments of the present invention.

[0038] The main frame 2 includes a top plate 21, a bottom plate 22 and several pillars 23; the top plate 21 is parallel to the bottom plate 22, and the pillars 23 are supported between the top plate 21 and the bottom plate 22; the pressure-applying component 3 is installed below the top plate 21, and the support component 4 is installed above the bottom plate 22.

[0039] This utility model also includes a dew point sensor and a pressure sensor installed in the sealed box 1, which are used to detect the humidity and pressure in the sealed box 1, respectively. These two sensors can be installed on the main frame 2, that is, above the top plate 21.

[0040] This utility model also includes a drive assembly 6 for driving the pressure application assembly 3; the drive assembly 6 includes a fixed bracket 61, a first motor 62, a guide rod 63, a lifting plate 64, a connecting rod 65, a trapezoidal nut 66, and a trapezoidal screw 67; the fixed bracket 61 and the first motor 62 are both installed on the upper surface of the main frame 2 (i.e., the upper surface of the aforementioned top plate 21); the guide rod 63 is connected between the fixed bracket 61 and the main frame 2; the lifting plate 64 is slidably fitted on the guide rod 63; the connecting rod 65 passes through the main frame 2, and its upper and lower ends are respectively connected to the lifting plate 64 and the pressure plate 31; a trapezoidal nut 66 is installed on the lifting plate 38, and the trapezoidal screw 67 is threadedly connected to the trapezoidal nut 66, and its two ends are respectively rotatably fitted with the fixed bracket 61 and the main frame 2; the first motor 62 is drivenly connected to the trapezoidal screw 67 and is used to drive the trapezoidal screw 67 to rotate. Therefore, the circular motion output by the motor can be converted into the lifting motion of the pressure plate 31, eliminating the need to drive the pressure plate 31 in the vertical direction. This saves space in the instrument's height, resulting in a more compact overall structure and a smaller instrument size.

[0041] Furthermore, the output end of the first motor 62 is connected to a driving wheel, and a driven wheel 68 is fixedly connected to the circumference of the trapezoidal screw 67. A first synchronous belt 69 is tensioned and wound between the driving wheel and the driven wheel 68. The transmission connection between the first motor 62 and the trapezoidal screw 67 is achieved through the driving wheel, the driven wheel 68, and the first synchronous belt 69. In this embodiment, the main frame 2 and the fixed bracket 61 are both provided with bearings 610 for the trapezoidal screw 67 to rotate and engage.

[0042] Meanwhile, the main frame 2 is provided with a guide sleeve 24 for the connecting rod 65 to pass through; there are at least two pairs of connecting rods 65 and guide sleeves 24, which are arranged at equal angles around the trapezoidal screw 67 to ensure that the lifting and lowering movement of the pressure plate 31 is more stable.

[0043] The lower end face of the piston 32 is provided with a mounting groove, and the upper end of the pressure rod 34 is sealed and embedded in the mounting groove to achieve a detachable connection; at least one sealing ring 35 is provided between the circumferential surface of the pressure rod 34 and the inner wall of the piston 32. The elasticity of the sealing ring 35 can ensure that the pressure rod 34 will not fall out of the piston 32, and can also prevent electrolyte from entering the piston 32.

[0044] The piston 32 has a screw part 321 on its upper end face and a limit ring 322 on its lower circumferential surface. The screw part 321 extends upward through the mounting hole 311 and is threadedly connected to a fixing nut 36. The spring 33 is sleeved on the circumferential surface of the piston 32, and its two ends abut against the end wall of the mounting hole 311 and the limit ring 322, respectively.

[0045] The surface of the aforementioned pressure rod 34 can be fitted with a pressure head sleeve, which can be directly replaced after each test, thereby reducing the amount of cleaning work.

[0046] The aforementioned support assembly 4 also includes a second motor 43, a synchronous pulley 44, a coupling 45, and a second synchronous belt 46. The second motor 43 is mounted on the main frame 2, the synchronous pulley 44 is coaxially connected to the support tray 41 through the coupling 45, and the second motor 43 and the synchronous pulley 44 are connected by a second synchronous belt 46 to drive the support tray 41.

[0047] The aforementioned liquid injection assembly 5 includes an injection head 51 and an electrolyte bottle 52 disposed on the side of the support tray 41, and a plunger pump 53 connecting the injection head 51 and the electrolyte bottle 52. A two-way threaded valve 54 may also be provided between the plunger pump 53 and the injection head 51. By controlling the opening and closing of the plunger pump 53 and the flow rate, a fixed amount of electrolyte can be automatically injected into the electrolyte tank 42. In this embodiment, the injection head 51 is fixed to the upper surface of the bottom plate 22 of the main frame 2 by a bracket, keeping it relatively stationary. The injection head 51 injects electrolyte into each electrolyte tank 42 one by one by rotating the support tray 41.

[0048] The testing procedure for this utility model is as follows:

[0049] (1) According to the test requirements, the sample to be tested is placed into each electrolyte tank 42, and the electrolyte tank 42 is placed into the support tray 41 in order to realize multi-channel testing;

[0050] (2) Close the sealing door 11, start the vacuum pump to evacuate the sealed box 1 to remove oxygen, and then fill the air inlet with inert gas to ensure that the water oxygen is <10ppm (detected by the dew point sensor and the air pressure sensor).

[0051] (3) The liquid injection assembly 5, in conjunction with the rotational motion of the support tray 41, sequentially injects a fixed amount of electrolyte into each electrolyte tank 42;

[0052] (4) Start the pressure application component 3, so that the pressure plate 31 drops and drives the pressure rod 34 to apply pressure to the sample to be tested in the electrolyte tank 42 so that it fits tightly;

[0053] (5) Start the EIS module of the instrument (the positive and negative terminals of the EIS module are electrically connected to the pressure rod 34 and the electrolyte tank 42 respectively), and test the electrolyte ion conductivity in multiple electrolyte tanks 42 at the same time.

[0054] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A disc-type ionic conductivity detector, characterized in that: It includes a sealed box, a main frame installed inside the sealed box, and a pressure application assembly, a support assembly, and a liquid injection assembly installed on the main frame; The sealed box is equipped with a movable sealing door, an air inlet, and an air outlet; The pressure application assembly includes a pressure plate that moves up and down relative to the support assembly; the pressure plate is provided with a plurality of mounting holes at equal angular intervals, and a piston is installed in the mounting holes; a spring is provided between the piston and the inner wall of the mounting hole; a pressure rod is installed on the lower end face of the piston; The support assembly includes a support tray that rotates with the main frame, and the support tray is provided with a plurality of electrolyte tanks; The electrolyte injection assembly is located on the side of the support tray and is used to automatically inject electrolyte into each electrolyte tank.

2. The disc-type ionic conductivity detector as described in claim 1, characterized in that: The main frame includes a top plate, a bottom plate, and several pillars; the top plate is parallel to the bottom plate, and the pillars are supported between the top plate and the bottom plate; the pressure-applying component is installed below the top plate, and the support component is installed above the bottom plate.

3. The disc-type ionic conductivity detector as described in claim 1, characterized in that: It also includes a dew point sensor and a pressure sensor installed inside the sealed box, which are used to detect the humidity and pressure inside the sealed box, respectively.

4. The disc-type ionic conductivity detector as described in claim 1, characterized in that: It also includes a drive assembly for driving the pressure application component; the drive assembly includes a fixed bracket, a first motor, a guide rod, a lifting plate, a connecting rod, a trapezoidal nut, and a trapezoidal screw; the fixed bracket and the first motor are both mounted on the upper surface of the main frame; a guide rod is connected between the fixed bracket and the main frame; the lifting plate is slidably fitted on the guide rod; the connecting rod passes through the main frame, and its upper and lower ends are respectively connected to the lifting plate and the pressure plate; a trapezoidal nut is installed on the lifting plate, and the trapezoidal screw is threadedly connected to the trapezoidal nut, with its two ends respectively rotatably fitted to the fixed bracket and the main frame; the first motor is drively connected to the trapezoidal screw.

5. The disc-type ionic conductivity detector as described in claim 4, characterized in that: The output end of the first motor is connected to a drive wheel, and the circumference of the trapezoidal screw is fixedly connected to a driven wheel. A first synchronous belt is tensioned and wound between the drive wheel and the driven wheel. The main frame and the fixed bracket are both equipped with bearings for the trapezoidal screw to rotate.

6. The disc-type ionic conductivity detector as described in claim 4, characterized in that: The main frame is provided with guide sleeves for the connecting rods to pass through; there are at least two pairs of connecting rods and guide sleeves, which are arranged at equal angular intervals around the trapezoidal screw.

7. The disc-type ionic conductivity detector as described in claim 1, characterized in that: The piston has a mounting groove on its lower end face, and the upper end of the pressure rod is sealed and embedded in the mounting groove to achieve a detachable connection; at least one sealing ring is provided between the circumferential surface of the pressure rod and the inner wall of the piston.

8. The disc-type ionic conductivity detector as described in claim 1, characterized in that: The piston has a screw section on its upper end face and a limit ring on its lower circumferential surface; the screw section extends upward through the mounting hole and is threadedly connected to a fixing nut; the spring is sleeved on the circumferential surface of the piston, and its two ends abut against the end wall of the mounting hole and the limit ring, respectively.

9. The disc-type ionic conductivity detector as described in claim 1, characterized in that: The support assembly further includes a second motor, a synchronous pulley, a coupling, and a second synchronous belt; the second motor is mounted on the main frame, the synchronous pulley is coaxially connected to the support tray through the coupling, and the second motor and the synchronous pulley are connected by a second synchronous belt.

10. The disc-type ionic conductivity detector as described in claim 1, characterized in that: The liquid injection assembly includes an injection head and an electrolyte bottle disposed on the side of the support tray, and a plunger pump connecting the injection head and the electrolyte bottle.

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